CODE NO. B1B70 Malfunction of G-sensor inside left front impact sensor
CODE NO. B1B71 Malfunction of G-sensor inside right front impact sensor
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If the diagnosis code B1B70 or B1B71 is set to SRS-ECU, be sure to diagnose the CAN bus line.
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- Analogue G-sensor in front impact sensor does not operate.
- Characteristics of analogue G-sensor in front impact sensor are abnormal.
- Output of analogue G-sensor in front impact sensor is abnormal.
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- Malfunction of left front impact sensor (with code No. B1B70)
- Malfunction of right front impact sensor (with code No. B1B71)
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting  ).
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STEP 2. Check whether the diagnosis code is reset.
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(1)Connect the negative battery terminal.
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(2)After erasing the diagnosis code memory, check the diagnosis code again.
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(3)Disconnect the negative battery terminal.
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Q.
Is the diagnosis code No. B1B70 or B1B71 set?
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Go to Step 3.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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STEP 3. Front impact sensor check.
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(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
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(2)Replace the right front impact sensor and left front impact sensor with the new parts.
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(3)Connect the negative battery terminal.
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(4)After erasing the diagnosis code memory, check the diagnosis code again.
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(5)Disconnect the negative battery terminal.
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Q.
Is the diagnosis code No. B1B70 or B1B71 set?
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Replace SRS-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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